What is this?

Maybe this will help.

I stopped at the store on my way home from teaching last night and parked under one of those tall, bright lights at the edge of the lot.  As I pulled out my grocery list, I noticed that the overhead light was casting shadows from the raindrops that streaked the windshield down onto the notepad in my hand.  (Yes, it was raining again last night.)

To me, those shadows made the paper look like marble.  So I took a picture.  Then I realized the photo would look way more attractive without my shopping list (milk, bread, eggs . . .), so I flipped the page to the next sheet.  But even without the list, I still had those lines on the paper.  Finally I thought of flipping over the notepad itself and photographing the shadowed gray cardboard.

I like it!